Truman j



(Nomad.)

T. J. PEARE.

LIFTING JACK.

No. 268,371. Patented Nov. 28, 1882.

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' UNITED STATES PATENT OFFICE.

TRUMAN J. PEAROE, OF OAKLAND, CALIFORNIA, ASSIGNOR OF ONE-HALF l TOLESTER BISHOP, OF SAME PLACE.

LlFTIvNG-JACK.

SPECIFICATION forming part of Letters Patent No. 268,371, dated November28, 1882.

Application ined May 15, 1882. '(No model.)

.To all whom Iit may concern Be it known that I, TRUMAN J. PEARCE, ofOakland, in the county of Alameda and State of California, have made andinvented a new and usefullmprovement in Lifting-Jacks; and I do herebydeclare that the following is a full, clear, and exact description ofthe same, reference beingV had to the accompanying drawlngs. V

My invention relates to an improved construction of lifting-jacks forcarriages, wagons, and other light work. The object sought to beattained is to produce a strong and durableimplement at a low cost, andto `afford better facilities for handling and operatin g it in positionwhere application of the power required to work it cannot be readilyor`directly made in the line of the actuating-lever. rfhese objects Iattain in the manner which I will now proceed to describe.

The accompanying drawings form a part of this specification andillustrate the invention.

. Figure l is a side elevation of the device with the hand-leverslightly elevated. Fig. 2 is a plan view ot' the same. Fig. 3 is a sideelevation with the lever brought to a horizontal position.

Similar letters of reference indicate correspondin g parts in all thefigures.

The post or standard A and the lift B may be made of some suitable woodcombining required strength with lightness. rlhe top of the lift isnotched or stepped to enable it to pass under and operate on differentheights ot'axles, two or more of these steps b being provided, accordingto the width of the lift or the range of adjustability to be given tothe jack. The faces of 'thesesteps are shod with iron plates b', toprevent wear and breakage. That portion of the post which` the liftworks on is reduced in thickness, so as to give lightness with asuitable margin of strength and the part below, forming foot of thestandard, is carried of full width, nearlyequal to .the width of thelift above it, to give proper stability. At the top and bottom ends ofthe lift a strap, D, is secured in position to embrace the standard andslide smoothly upon it as vertical movement is given tothe lift, andagainst one side of the standard, at a point between the 5o two straps,the operating-lever E is pivoted. This lever, while made of any requiredlength, has its inner end formed into a broad and flat head, somewhat ofa curved shape, so as to give increased breadth at this part around andabove the fulcrum, and it is carried out beyond the standard and behindthe fulcrnm,

so as to extend along the side of the lift. The object of thisconstruction is twofold first,

t0 acord different points of attachment on the 6o head for the outer endof the link G, by which the position or angle of inclination of thelever can be kept as nearly as possible to the horizontal at the timethe lift is set up; and, secondly, to give a brace or support along andagainst the side of the link, so that no lateral pressure or strainderived from any unequal weight on the end of the lift shall actdirectly upon the link. This gives a very strong connection of the liftand standard without the 7o necessity7 of employing cheek-pieces, ribs,and grooves, or other construction to prevent lateral movement.

In such kinds of lifting-jacks where its position, when in use,frequently renders it diflicult to reach and work the hand-lever withsufl'icient application of force to bring 'the lift to the requiredheight, I find a great advantage is obtained by making the connection ofthe end of the curved link with the lever at such 8o point that when thelift is raised to the required height the t'hree points will be broughtinto line at the time the lever approaches a horizontal or nearlyhorizontal position. In such case the force required to raise theweightcan be more directly and elfectively applied than in otherconstructions where the outer end of the lever requires to be presseddown nearly to the grou-nd, because the diiiiculty of applying pressureincreases as the end of the lever 9o passes beyond the horizontal line.The end of the curved link can be attached to the lever at severaldii'erent points, h, which are provided in the enlarged head of thelever above its fulcrum, so that a longer or shorter movcment can begiven to the lift, according as one or the other of the steps or notchesis brought into service.

Having thus fully described my invention, tached to the lift at one end,and having ad- 1o what I claim, and desire to secure by Letters jnstebleattachment to the lever at points Patent, isabove the fulcrum thereof.

The herein-described lifting-jack, consisting /Vitness my hand and seal.of the standard with its foot, the ste) ed lift, the straps connectingsaid lift to the stgndard, TRUMAN J' PEARGE [L S l the pivoted leverhaving the enlarged head Witnesses: projecting beyond the standard andagainst D. SELLECK, the side of the lift, and the curved link at- EDWARDE. OSBORN.

